Western Yellow Wagtail subspecies Bangladesh (1 Viewer)

Went birding this morning outside Dhaka, and had a big group of Western Yellow Wagtails. There was a flock of at least forty of them. The first picture I'm pretty sure is the common subspecies here flava beema. The second one I'm not sure about, and the third one looks like a flava thunbergi to me. But I'm not sure about the IDs especially because these were a lifer for me, and yellow wagtail subspecies are a pain to identify. Would appreciate any help.

I emailed Sayam Chowdhury, one of the top birders in Bangladesh, and he confirmed that the first is flava beema and the second two are flava thunbergi.